Let's count!

A domino is a 2 × 1 2\times1 or 1 × 2 1\times2 tile.

Let N N be the number of ways placing 100 100 dominoes without overlapping on a 20 × 20 20\times20 chessboard so that every 2 × 2 2\times2 square contains at least two uncovered unit squares which lie in the same row or column.

Find the last 4 digits of N N .


The answer is 9536.

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1 solution

Pranjit Handique
Aug 26, 2015

Please go to this link . Everything is explained there.

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